## Description
- Catch network exceptions when querying to populate the nav drawer
- Perform screensaver work on IO thread
- Fix possible crash if screensaver service runs while regular activity
is destroyed
- Fix genre images & backdrop images not loading
This PR also adds an Jellyfin SDK `ApiClient` wrapper to push all
network calls onto the IO thread. And tries to use a more strict
network-on-main policy for debug builds.
### Related issues
Fixes#994Fixes#1001
Should fix#1003
### Testing
Emulator with simulated exception throws
## Screenshots
N/A
## AI or LLM usage
None
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